﻿using System.Diagnostics.Contracts;
using System.Linq.Expressions;

namespace System.Reactive.Linq
{
	public static partial class Qbservable
	{
		public static IQbservable<TResult> Publish<TSource, TResult>(this IQbservable<TSource> source, Expression<Func<IObservable<TSource>, IObservable<TResult>>> selector)
		{
			Contract.Requires(source != null, null, "source != null");
			Contract.Requires(selector != null, null, "selector != null");
			Contract.Ensures(Contract.Result<IQbservable<TResult>>() != null, null, "Contract.Result<IQbservable<TResult>>() != null");
			return null;
		}

		public static IQbservable<TResult> Publish<TSource, TResult>(this IQbservable<TSource> source, Expression<Func<IObservable<TSource>, IObservable<TResult>>> selector, TSource initialValue)
		{
			Contract.Requires(source != null, null, "source != null");
			Contract.Requires(selector != null, null, "selector != null");
			Contract.Ensures(Contract.Result<IQbservable<TResult>>() != null, null, "Contract.Result<IQbservable<TResult>>() != null");
			return null;
		}

		public static IQbservable<TResult> PublishLast<TSource, TResult>(this IQbservable<TSource> source, Expression<Func<IObservable<TSource>, IObservable<TResult>>> selector)
		{
			Contract.Requires(source != null, null, "source != null");
			Contract.Requires(selector != null, null, "selector != null");
			Contract.Ensures(Contract.Result<IQbservable<TResult>>() != null, null, "Contract.Result<IQbservable<TResult>>() != null");
			return null;
		}
	}
}